/*! Copyright (c) 2010 Brandon Aaron (http://brandonaaron.net)
  * Licensed under the MIT License (LICENSE.txt).
  *
  * Version 2.1.2
  */
 
 (function($){
 
 $.fn.bgiframe = ($.browser.msie && /msie 6\.0/i.test(navigator.userAgent) ? function(s) {
     s = $.extend({
         top     : 'auto', // auto == .currentStyle.borderTopWidth
         left    : 'auto', // auto == .currentStyle.borderLeftWidth
         width   : 'auto', // auto == offsetWidth
         height  : 'auto', // auto == offsetHeight
         opacity : true,
         src     : 'javascript:false;'
     }, s);
     var html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
                    'style="display:block;position:absolute;z-index:-1;'+
                        (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
                        'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
                        'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
                        'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
                        'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
                 '"/>';
     return this.each(function() {
         if ( $(this).children('iframe.bgiframe').length === 0 )
             this.insertBefore( document.createElement(html), this.firstChild );
     });
 } : function() { return this; });
 
 // old alias
 $.fn.bgIframe = $.fn.bgiframe;
 
 function prop(n) {
     return n && n.constructor === Number ? n + 'px' : n;
 }
 
 })(jQuery);